who supplies avatarbingo.com with software and what other bingo
sites/affiliates do they have (angel bingo?)

Hello bevyann-ga,
It's the 'original' owners of iBingoClub that outsourced
avatarbingo.com with software,
and the other sites that affilated in some way (like angel bingo
example you have given) are:
(All hosted on the same netserver):
angelbingo.com
avatarbingo.com
bingoauthority.com
bingobookstore.com
bingofetch.com
bingojudge.com
bingolisting.com, .net, .org
bingosafe.org
bingoseal.com
bingoseal.org
bingosecure.com
bingosecure.net
bingotimes.com
bingotruth.net
bransonbingo.com
butterflybingo.com
cyberbingoclub.com, .net, .org
gammonquest.com
ibingoclub.com
libertybingo.com
miamisands.com
onlinebingoclub.com
( http://www.bingobugle.com/rumors.html )
I say original owners as they were forced to handover their domain
name ibingoclub to ibingo - Craig Williamson Focus F, Ltd, Henderson,
NV
http://www.arb-forum.com/domains/decisions/104188.htm
.
In this welcome letter at avatarbingo.com
http://www.avatarbingo.com/letter.htm
signs off as "Sincerely, Craig Williamson President "
.
Craig Williamson also appears to be behind  'wind 'n sea gaming'
"Wind 'n Sea Gaming is a casino management outfit operating from
Belize (at present) with a CEO called Craig Williamson (aka Shawn
Brady) who is a disgraced former manager from Bingomania"
.
"There are a number of casinos which have entrusted their affairs to
his company, which supplies both livechat support (Jungle Management)
and e-cash processing. The casinos are nicely put together and all
come equipped with a comprehensive Java gambling suite from Canadian
software provider Chartwell Technology. Chartwell was last week
selected by Harrahs to provide Play for Free games on its revamped
website - a major software coup."
.
Chartwell Technology appear to power his sites
http://games.chartwelltechnology.com/cwh/products/products.jsp
verified by the below article 
.
“Gemstone Casino.com This was at one time a Chartwell-powered Java
casino in bed with the notorious Wind 'n Sea outfit headed by Craig
Williamson alias Shaun Brady. It has disappeared and the site now
re-routes to a Grand Virtual- powered site owned by Universal
Amusements Inc and branded Imperial Casino.com.”
source: http://www.casinomeister.com/news/february2002.html
.
Search strategy:
.
avatarbingo software
://www.google.com/search?q=avatarbingo+software&hl=en&lr=&ie=UTF-8&start=10&sa=N
.
ibingoclub
://www.google.com/search?hl=en&ie=ISO-8859-1&q=ibingoclub&btnG=Google+Search
.
“Craig Williamson” bingo
://www.google.com/search?hl=en&ie=ISO-8859-1&q=%22Craig+Williamson%22+bingo&btnG=Google+Search
.

Canadian software provider chartwell technology
://www.google.com/search?hl=en&ie=ISO-8859-1&q=Canadian+software+provider+Chartwell+Technology&btnG=Google+Search
.
I hope that helps,
kind regards
lot-ga

you rock!